Improvement in carriage-bolts



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Lettere Patent No. 68,554, dated September 3, 1867. v

IMPROVEMENT IN GARRIAGBfBOLIS.v

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'lO ALL WIIOM I'l MAY CONCERN:

Ile it known that I, O. C. BURDICT, of New Haven, in the county of New Haven, and State of Connecticut,

have invented a new Improvement in Carriage-Bolts; and I do hereby declarethe following, when taken in connectiou witlrt-he accompanying drawings and the letters of reference marked thereon, to be a. full, clear, and exact description of. the same, and which said drawings constitute part of this specification, and represent, in-

Figurel, a side view.

.Figure 2, a side view turned one-quarter around from fig. 1'; and in Figure 3 a section on line a; a'.

This invention relates to an improvement in that class of bolts commonly called carriage-bolts. These bolts require to be so formed at the neck that they will not turn in the wood when the` nut is being screwed on. '.lo do this they are commonly made from square iron and drawn down from the neck, which makes these bolts somewhat expensive in' the manufacture. Various devices have been resorted to to overcome this diHiculty, but none as yet have reduced the cost of manufacture. As the neck of the bolt is usually square it is necessary to cut away the wood to receive the neck before the insertion of the bolt. By my inventionthis last necessity is avoided, and the cost of manufacture very greatly reduced. And my invention consists in striking a rib upon' one or both sides of the bolt directly under the head, which rib is so thin that the holt may be readily driven into the wood, and yet suilicient to prevent the turning of the bolt.

In order to the clear umlerstamling of my invention, as well as to enable others to construct the sume, I will proceed to a description thereof, as illustrated in the accompanying drawings. l

The blank A is cut and headed in the usual manner; and, eithcrbefore or after heading, either in the same machine or another, by properly;i`ormed dies, I form upon one or both sides of the neck of the bolt a rib, a, by striking upon the metal so as to force the rib from the body, as seen in fig. 3. This rib should be wedgeshape, that is, comparatively sharp upon its edge, so as to be easilydriven into the wood, projecting but slightly beyond the body of the bolt. This is donc at .a single blow, and adds to, rather than reduces, the strength of the neck; avoids the necessity of cutting the-wood to receive the neck; and is therefore a cheaper bolt, in that it costs less to manufacture, and requires less time in its use.

Having thus fully described my invention, what I claim as new and useful, and desire to secure'by Letters Patent, is-

A bolt having formed upon one or more sides of its neck a rib a, substantially in the manner and for the purpose as set forth.

O. C. BURDICT.

Witnesses JOHN E. EARLE, A. J. TIBBITS. 

